1 files changed, 16 insertions, 2 deletions
diff --git a/src/libstd/env.rs b/src/libstd/env.rs
index 770bca7524c..1dfae0ce83f 100644
--- a/src/libstd/env.rs
+++ b/src/libstd/env.rs
@@ -741,7 +741,9 @@ impl DoubleEndedIterator for Args {
 #[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for Args {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        f.pad("Args { .. }")
+        f.debug_struct("Args")
+            .field("inner", &self.inner.inner.inner_debug())
+            .finish()
     }
 }
 
@@ -766,7 +768,9 @@ impl DoubleEndedIterator for ArgsOs {
 #[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for ArgsOs {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        f.pad("ArgsOs { .. }")
+        f.debug_struct("ArgsOs")
+            .field("inner", &self.inner.inner_debug())
+            .finish()
     }
 }
 
@@ -1114,4 +1118,14 @@ mod tests {
                         r#""c:\te;st";c:\"#));
         assert!(join_paths([r#"c:\te"st"#].iter().cloned()).is_err());
     }
+
+    #[test]
+    fn args_debug() {
+        assert_eq!(
+            format!("Args {{ inner: {:?} }}", args().collect::<Vec<_>>()),
+            format!("{:?}", args()));
+        assert_eq!(
+            format!("ArgsOs {{ inner: {:?} }}", args_os().collect::<Vec<_>>()),
+            format!("{:?}", args_os()));
     }
+}